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Article 810.21 of the National Electric Code, ANSI/NFPA No.70, provides information with regard to proper grounding of the mast and supporting structure, grounding of the lead-in wire to the antenna discharge unit, size of grounding conductors, location of antenna-discharge unit, connection of grounding electrodes, and requirements for the grounding electrode. l Caution for users/installers in Norway - In Norway, there exists a possibility of a hazardous situation due to voltage difference betwe